>But they are not looking to destroy the world or the region, and yes, sorry to say, but Iran is.

Then why did Iran discontinue their other WMD programs, like much cheaper and easier to manage chemical weapons programs?

Why is Iran holding back and not targeting Israel's water infrastructure? If they just want to kill everyone they have options right now that they aren't taking.

Why does Iran hold back if they would use a nuke as soon as they get one because they just want to destroy the region?

Iran objectively wants to build a nuke, and has willingly sacrificed everything to do it, but it wouldn't have taken becoming a rogue state and trillions of dollars of GDP to kill Israel to their liking. Other than a nuke, Israel's retaliation options are fairly limited.